A. Is it up to us to drive the plot? If so, should I be--or rather, do I have the pleasure of--making a someone desinged specificly to create conflict and molest female superheroines?
There will be subplots from time to time, but no overall plot to follow. So yes, you can make a molester of some sort.
B. If its not up to us to drive the plot, who creates the conflict?
There will be lots of conflict. Hell, there's already conflict between the four sects.
C. Are the four sectors set in stone, or are they trying to conquer each other?
They are set in stone, /but/ a person from another sect can try conquer a major position in another.
D. Is everyone from all of history here, or only a few people, and only from the last few generations? Are there other citties of the dead out there, acessible by traveling milliosn of miles across baren waistlands?
People from history are scattered across many cities- And you don't have to travel far, just a few hours to reach the next city, although this story will be done in a newish city.